"And behold, even your relative Elizabeth has also conceived a son in her old age; and she who was called barren is now in her sixth month. For nothing will be impossible with God.”
Mary doesn't doubt God, but He graciously gives her a sign of His miraculous abilities. Her relatives Elizabeth and Zacharias, two old people beyond child-bearing years, are expecting a son. God has opened Elizabeth's womb, but He will do an even greater miracle in Mary. Gabriel said, "For nothing will be impossible with God." Thirty-three years after Gabriel speaks these words to Mary, the immaculately conceived Savior will say to His disciples, "with God all things are possible.” (Matthew 19:26). Hundreds of years earlier, God said to Abraham, "Is anything too difficult for the LORD?" (Genesis 18:14). Through the ages God has said He can do the impossible. And He has. If we fail to believe nothing is impossible with God, it is our faith that has failed us. Not God.